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hill36447(at)bellsouth.ne
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 Posted: Thu Mar 27, 2008 5:43 pm Post subject: New noise in NAV radio |
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Last Sunday on a flight from Charleston to Knoxville, my KN-53 Nav radio developed a noise/static whenever I turned up the volume. The noise is in both the pilot and passenger headsets. It is bad enough that I have a difficult time hearing transmissions from NAV sources (weather, FSS, etc.) It also seems to be picking up surrounding EMF that was not an issue previously. I borrowed another KN 53 and got the same result. Also, it is there with the engine not running, but other avionic units powered up. Understand this was not a problem until recently. I checked the connections to the antenna and they seem OK. The antenna does not appear to have any damage. If the antenna leadwire shielding broke at the tray connector, would it result in this kind of problem? Any suggestions would be appreciated.
Ken Hill
RV-9A
Kingston, TN
[quote][b]
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aerobubba(at)earthlink.ne
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| Posted: Fri Mar 28, 2008 3:57 am Post subject: New noise in NAV radio |
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Hi Ken!
glen matejcek
aerobubba(at)earthlink.net
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tomasz(at)korwel.net
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| Posted: Fri Mar 28, 2008 4:29 am Post subject: New noise in NAV radio |
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Ken Hill wrote:
| Quote: | Last Sunday on a flight from Charleston to Knoxville, my KN-53 Nav
radio developed a noise/static whenever I turned up the volume. The
noise is in both the pilot and passenger headsets. It is bad enough
that I have a difficult time hearing transmissions from NAV sources
(weather, FSS, etc.) It also seems to be picking up surrounding EMF
that was not an issue previously. I borrowed another KN 53 and got
the same result. Also, it is there with the engine not running, but
other avionic units powered up. Understand this was not a problem
until recently. I checked the connections to the antenna and they
seem OK. The antenna does not appear to have any damage. If the
antenna leadwire shielding broke at the tray connector, would it
result in this kind of problem? Any suggestions would be
appreciated.
First you can try eliminating source of interferences but turning as
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many of your other instruments as you can, one by one checking if the
noise disappears after you do it. If it won't help try to disconnect
(again one by one checking results every time) any electrical gyros (if
you have them). How about fuel pump?
--
Tomasz
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tracy(at)rotaryaviation.c
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| Posted: Fri Mar 28, 2008 5:49 am Post subject: New noise in NAV radio |
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The coax shield is a possibility. If not, start unplugging the other avionics until you identify the guilty party.
Tracy Crook (EE geek)
On Thu, Mar 27, 2008 at 9:39 PM, Ken Hill <hill36447(at)bellsouth.net (hill36447(at)bellsouth.net)> wrote:
[quote] Last Sunday on a flight from Charleston to Knoxville, my KN-53 Nav radio developed a noise/static whenever I turned up the volume. The noise is in both the pilot and passenger headsets. It is bad enough that I have a difficult time hearing transmissions from NAV sources (weather, FSS, etc.) It also seems to be picking up surrounding EMF that was not an issue previously. I borrowed another KN 53 and got the same result. Also, it is there with the engine not running, but other avionic units powered up. Understand this was not a problem until recently. I checked the connections to the antenna and they seem OK. The antenna does not appear to have any damage. If the antenna leadwire shielding broke at the tray connector, would it result in this kind of problem? Any suggestions would be appreciated.
Ken Hill
RV-9A
Kingston, TN
[b]
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rickpegser(at)yahoo.com
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| Posted: Fri Mar 28, 2008 3:15 pm Post subject: New noise in NAV radio |
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ken
is the noise steady at a perticular hertz, like a 60 cycle hum from an old stereo or does it change freqs and amplitude while flying. if it is steady then is sound like the fliter caps on a switching power supply have gone bad. if it varies it might be a bad ground or bonding strap and one part of the fuselage is charging up then discharging, This problem is normally id by a bust thru the radios. I had it so bad in a 727 that it would take out the radios for about two minuets ever half hour. it turned out to be that the contractor that had redone the fiberglass panels had not applied the antistatic paint for the bonding layer.
You have said that it happens when it is on the ground engine not running, start pulling breakers for other instrument and lights. and see if it goes away. Also check the case grounds vrs the battery neg. instrument ground should not beconfused with battery neg grounds. hope that this helps. by the way sheilds are to be grounded at one end only.
rick
Tracy Crook <tracy(at)rotaryaviation.com> wrote:
[quote] The coax shield is a possibility. If not, start unplugging the other avionics until you identify the guilty party.
Tracy Crook (EE geek)
On Thu, Mar 27, 2008 at 9:39 PM, Ken Hill <hill36447(at)bellsouth.net (hill36447(at)bellsouth.net)> wrote:
[quote] Last Sunday on a flight from Charleston to Knoxville, my KN-53 Nav radio developed a noise/static whenever I turned up the volume. The noise is in both the pilot and passenger headsets. It is bad enough that I have a difficult time hearing transmissions from NAV sources (weather, FSS, etc.) It also seems to be picking up surrounding EMF that was not an issue previously. I borrowed another KN 53 and got the same result. Also, it is there with the engine not running, but other avionic units powered up. Understand this was not a problem until recently. I checked the connections to the antenna and they seem OK. The antenna does not appear to have any damage. If the antenna leadwire shielding broke at the tray connector, would it result in this kind of problem? Any suggestions would be appreciated.
Ken Hill
RV-9A
Kingston, [quote][b]
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http://www.matronics.com/Navigator?RV-List |
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